The pathogenPhytophthora capsicicauses bell pepper plants to wilt and die. A research project was designed to study the effect of soil water content and the spread of the disease in fields of bell peppers (Source:Journal of Agricultural, Biological, and Environmental Statistics, Vol. 2, No. 2). It is thought that too much water helps spread the disease. The fields were divided into rows and quadrants. The soil water content (percent of water by volume of soil) was determined for each plot. An important first step in such a research project is to give a statistical description of the data.Soil Water Content for Bell Pepper Study

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(b) Find the interquartile range.

(c) Make a frequency table using four classes.

class

f 6-8 9-11. 12-14 15-17

Then estimate the mean and sample standard deviation using the frequency table. (Round your answers to two decimal places.)

x=

s=

Compute a 75% Chebyshev interval centered about the mean. (Round your answers to two decimal places.)

Lower limit

Upper limit

(d) If you have a statistical calculator or computer, use it to find the actual sample mean and sample standard deviation. (Round your answers to two decimal places.)

x=

s=